Tradable effluent permits Tradable effluent permits EPA > Watersheds > Trading > Frequently Asked Questions About Water Quality Trading EPA > Watersheds > Trading > Frequently Asked Questions About Water Quality Trading EPA > Watersheds > Trading > Frequently Asked Questions About Water Quality Trading EPA > Watersheds > Trading > Frequently Asked Questions About Water Quality Trading Advantages of effluent permit trading Advantages of effluent permit trading Cost-effectiveness Cost-effectiveness Problems with effluent permit trading Problems with effluent permit trading Hot spots.